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    Falling Objects

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    A first stone is dropped from the roof of a building. 2.50 s after that, a second stone is thrown straight down with an initial speed of 30.0 m/s, and it is observed that the two stones land at the same time.

    (a) How long did it take the first stone to reach the ground?

    (b) How high is the building?

    (c) What are the speeds of the two stones just before they hit the ground?

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    Solution Summary

    This solution provides a simple formula for calculating height, which can be rearranged to find speed and time to solve the three questions.